knowledge about the origin of chordates it has come to conclusion that there are many similarities and common ancestry brought into play about the origin of chordates. Chordates aren’t a development of its own species but it is a development of different phylums such as the echinoderm‚ the cephalochordate‚ hemichordates‚ pogonophorans. Chordates evolved from some deuterostome ancestor as they have similarities in embryonic development‚ type of coelom and larval stages. Another interesting fact that I learned
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Phylum nematode Characteristics of Nematoda:- 1)Bilaterally symmetrical‚ and vermiform. 2) Body has more than two cell layers‚ tissues and organs. 3) Body cavity is a pseudocoel‚ body fluid under high pressure. 4) Body possesses a through gut with a subterminal anus. 5) Body covered in a complex cuticle. 6) Has a nervous system with pharyngeal nerve ring. 7) Has no circulatory system (no blood system) 8) Reproduction normally sexual and gonochoristic. 9) feed on just about everything
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Porifera? Porifera is a phylum under the kingdom of Animalia. Porifera is the oldest phylum in this kingdom and has been around for the last 600 million years. The most common organism in this phylum is sponges. Porifera comes from the Latin words porus (pore) and ferre (bear)‚ meaning "pore-bearer". This is a reference to the numerous holes (pores) on the sponge ’s surface. Characteristics of Porifera All organisms belonging to the phylum Porifera; Have no definite symmetry Have
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NEWLY DISCOVERED DEEP-SEA MARINE CARNIVOROUS SPONGE Phylum Porifera is considered as a simplest form of animal consisting of sponges. Many families under this phylum have distinctive characteristics specifically feeding processes that help them become successful in terms of adaptation and survival despite of being simple and some are smaller compared to other marine organisms. A new species of carnivorous sponge (Phylum Porifera) have been discovered in the coast of Namibia particularly in the
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"soft")‚ which is generally protected by a hard‚ calcium- containing shell. In some forms however‚ the shell has been lost in the course of evolution‚ as in slugs and octopuses‚ or greatly reduced in size and internalized‚ as in squids. Mollusks (Phylum Mollusca) are found in marine‚ brackish‚ and fresh waters. They include a diverse group of animals such as clams‚ mussels‚ oysters‚ scallops‚ abalone‚ conchs‚ shipworms‚ snails‚ nudibranchs‚ chitons‚ squids‚ and octopuses. Common methods of introduction
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Cytochrome-C Comparison Brief Description: The molecular clock refers to mutations in DNA nucleotide sequence of genes occurring at a constant rate over time. The greater the difference in nucleotide sequence between two individuals of different species‚ the greater the amount of time has passed since they diverged from a common ancestor. The molecular clock helps to provide evidence to support conclusions previously based on comparative morphology and fossil records. Hypothesis: One hypothesis
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Watson Aquatic Science P.5 3/23/2013 Invertebrate Research – Stove Pipe Sponge If a diver or went snorkeling‚ it would be very lucky to find the Aplysina archeri‚ also known as the Stove Pipe Sponge. This sponge is in the Kingdom of Animalia‚ Phylum of Porifera‚ Class of Demosphongiae‚ Order of Verongida‚ Family of Aplysinidae‚ Genus of Aplysina‚ and Species of A. archeri. This sponge gets its name from its cylindrical shape and long tube like structure. It can grow up to 150 cm long with diameter
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M.fasciatus biodiversity issues and conservation The banded anteater (Myrmecobius Fasciatus) is a small marsupial found only in Australia. The M.fasciatus has pale fur on the underbelly and coarse reddish-brown fur above on the back which is darkest on the rump refer to figure 1 (Sydenham‚ 2012). There are four to eleven noticeable white stripes across the back between the shoulders and tail (|The Western Australian Education‚ 2013). The reason for the stripes is that it projects as an effective
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Phylum Echinodermata Introduction • Means “spiny skin” in Greek • Echinoderms are found at every ocean depth‚ from the intertidal zone to the abyssal zone. The phylum contains about 6500-7000 living species‚ making it the second-largest grouping of deuterostomes (a superphylum)‚ after the chordates. • Echinoderms are also the largest phylum that has no freshwater or terrestrial (land-based) representatives. Defining characteristics: • A complex series of fluid-filled canals
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Phylum Chordata • The chordates occupy the highest position in the food chain. • The name phylum was derived from the characteristic which all chordates share‚ the notochord – a long‚ elongated‚ and flexible cartilaginous structure that runs the entire length of the body. (Gr. noto = the back; chorde = string) Characteristics: • A dorsal nerve cord located above the notochord‚ it runs the entire length of the body. The nerve cord is a bundle of nerve fibers that connects the
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